Groundwater Flow System in the Central and South Part of Matsumoto Basin, Nagano, Estimated from Oxygen and Hydrogen Stable Isotope Ratios and Water Quality

概要

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The Matsumoto Basin, which is lo c ated in a high land with altitude of 550m to 750m surrounded by high mountains, depends considerably on groundwater for domestic, agricultural, industrial and urban uses. An understanding of recharge zone and the flow path of the groundwater provides important strategy into the resource management and prevention of groundwater contamination.<BR>We investigated stable isotope of oxygen and hydrogen and water quality of groundwater in order to identify the recharge zones and flow paths in the Matsumoto Basin. All stable isotope data fell on a meteoric line widely. The spatial distributions of the oxygen and hydrogen stable isotopic ratios, water quality and altitude effect against oxygen stable isotope of groundwater indicate that flow systems of shallow groundwater and deep groundwater, five recharge zones and seven flow paths are distinguishable in the study region. The four flow paths of shallow and deep groundwater system are along river flows. The two flow paths through each of two inferred faults, which are covered by the alluvial thin layer, are estimated by lower 6180 and 6D values. A flow path through an inferred fault into the deeper aquifer is estimated by the comparison of water compositions and the stable isotope data of the deep groundwater with those of the shallow groundwater.
Japanese Association of Groundwater Hydrologyの論文